utils: run commands using utf-8 string on Windows

src/util.cpp

@@ -58,6 +58,7 @@
 #ifndef NOMINMAX
 #define NOMINMAX
 #endif
+#include <codecvt>
 
 #include <io.h> /* for _commit */
 #include <shlobj.h>
@@ -1135,7 +1136,11 @@ fs::path GetSpecialFolderPath(int nFolder, bool fCreate)
 void runCommand(const std::string& strCommand)
 {
     if (strCommand.empty()) return;
+#ifndef WIN32
     int nErr = ::system(strCommand.c_str());
+#else
+    int nErr = ::_wsystem(std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>,wchar_t>().from_bytes(strCommand).c_str());
+#endif
     if (nErr)
         LogPrintf("runCommand error: system(%s) returned %d\n", strCommand, nErr);
 }